mutter/src/compositor/meta-background-actor.c

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/* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*- */
/*
* meta-background-actor.c: Actor for painting the root window background
*
* Copyright 2009 Sander Dijkhuis
* Copyright 2010 Red Hat, Inc.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of the
* License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
* 02111-1307, USA.
*
* Portions adapted from gnome-shell/src/shell-global.c
*/
#include <config.h>
#define COGL_ENABLE_EXPERIMENTAL_API
#include <cogl/cogl-texture-pixmap-x11.h>
#include <X11/Xatom.h>
#include "cogl-utils.h"
#include "compositor-private.h"
#include <meta/errors.h>
#include "meta-background-actor.h"
struct _MetaBackgroundActorClass
{
ClutterActorClass parent_class;
};
struct _MetaBackgroundActor
{
ClutterActor parent;
CoglHandle material;
MetaScreen *screen;
cairo_region_t *visible_region;
float texture_width;
float texture_height;
guint have_pixmap : 1;
};
G_DEFINE_TYPE (MetaBackgroundActor, meta_background_actor, CLUTTER_TYPE_ACTOR);
static void
update_wrap_mode (MetaBackgroundActor *self)
{
int width, height;
CoglMaterialWrapMode wrap_mode;
meta_screen_get_size (self->screen, &width, &height);
/* We turn off repeating when we have a full-screen pixmap to keep from
* getting artifacts from one side of the image sneaking into the other
* side of the image via bilinear filtering.
*/
if (width == self->texture_width && height == self->texture_height)
wrap_mode = COGL_MATERIAL_WRAP_MODE_CLAMP_TO_EDGE;
else
wrap_mode = COGL_MATERIAL_WRAP_MODE_REPEAT;
cogl_material_set_layer_wrap_mode (self->material, 0, wrap_mode);
}
static void
set_texture (MetaBackgroundActor *self,
CoglHandle texture)
{
MetaDisplay *display;
display = meta_screen_get_display (self->screen);
/* This may trigger destruction of an old texture pixmap, which, if
* the underlying X pixmap is already gone has the tendency to trigger
* X errors inside DRI. For safety, trap errors */
meta_error_trap_push (display);
cogl_material_set_layer (self->material, 0, texture);
meta_error_trap_pop (display);
self->texture_width = cogl_texture_get_width (texture);
self->texture_height = cogl_texture_get_height (texture);
update_wrap_mode (self);
clutter_actor_queue_redraw (CLUTTER_ACTOR (self));
}
/* Sets our material to paint with a 1x1 texture of the stage's background
* color; doing this when we have no pixmap allows the application to turn
* off painting the stage. There might be a performance benefit to
* painting in this case with a solid color, but the normal solid color
* case is a 1x1 root pixmap, so we'd have to reverse-engineer that to
* actually pick up the (small?) performance win. This is just a fallback.
*/
static void
set_texture_to_stage_color (MetaBackgroundActor *self)
{
ClutterActor *stage = meta_get_stage_for_screen (self->screen);
ClutterColor color;
CoglHandle texture;
clutter_stage_get_color (CLUTTER_STAGE (stage), &color);
texture = meta_create_color_texture_4ub (color.red, color.green,
color.blue, 0xff);
set_texture (self, texture);
cogl_handle_unref (texture);
}
static void
on_notify_stage_color (GObject *stage,
GParamSpec *pspec,
MetaBackgroundActor *self)
{
if (!self->have_pixmap)
set_texture_to_stage_color (self);
}
static void
meta_background_actor_dispose (GObject *object)
{
MetaBackgroundActor *self = META_BACKGROUND_ACTOR (object);
meta_background_actor_set_visible_region (self, NULL);
if (self->material != COGL_INVALID_HANDLE)
{
cogl_handle_unref (self->material);
self->material = COGL_INVALID_HANDLE;
}
if (self->screen != NULL)
{
ClutterActor *stage = meta_get_stage_for_screen (self->screen);
g_signal_handlers_disconnect_by_func (stage,
(gpointer) on_notify_stage_color,
self);
self->screen = NULL;
}
}
static void
meta_background_actor_get_preferred_width (ClutterActor *actor,
gfloat for_height,
gfloat *min_width_p,
gfloat *natural_width_p)
{
MetaBackgroundActor *self = META_BACKGROUND_ACTOR (actor);
int width, height;
meta_screen_get_size (self->screen, &width, &height);
if (min_width_p)
*min_width_p = width;
if (natural_width_p)
*natural_width_p = height;
}
static void
meta_background_actor_get_preferred_height (ClutterActor *actor,
gfloat for_width,
gfloat *min_height_p,
gfloat *natural_height_p)
{
MetaBackgroundActor *self = META_BACKGROUND_ACTOR (actor);
int width, height;
meta_screen_get_size (self->screen, &width, &height);
if (min_height_p)
*min_height_p = height;
if (natural_height_p)
*natural_height_p = height;
}
static void
meta_background_actor_paint (ClutterActor *actor)
{
MetaBackgroundActor *self = META_BACKGROUND_ACTOR (actor);
guchar opacity = clutter_actor_get_paint_opacity (actor);
int width, height;
meta_screen_get_size (self->screen, &width, &height);
cogl_material_set_color4ub (self->material,
opacity, opacity, opacity, opacity);
cogl_set_source (self->material);
if (self->visible_region)
{
int n_rectangles = cairo_region_num_rectangles (self->visible_region);
int i;
for (i = 0; i < n_rectangles; i++)
{
cairo_rectangle_int_t rect;
cairo_region_get_rectangle (self->visible_region, i, &rect);
cogl_rectangle_with_texture_coords (rect.x, rect.y,
rect.x + rect.width, rect.y + rect.height,
rect.x / self->texture_width,
rect.y / self->texture_height,
(rect.x + rect.width) / self->texture_width,
(rect.y + rect.height) / self->texture_height);
}
}
else
{
cogl_rectangle_with_texture_coords (0.0f, 0.0f,
width, height,
0.0f, 0.0f,
width / self->texture_width,
height / self->texture_height);
}
}
#if CLUTTER_CHECK_VERSION(1, 5, 2)
static gboolean
meta_background_actor_get_paint_volume (ClutterActor *actor,
ClutterPaintVolume *volume)
{
MetaBackgroundActor *self = META_BACKGROUND_ACTOR (actor);
int width, height;
meta_screen_get_size (self->screen, &width, &height);
clutter_paint_volume_set_width (volume, width);
clutter_paint_volume_set_height (volume, height);
return TRUE;
}
#endif
static void
meta_background_actor_class_init (MetaBackgroundActorClass *klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
ClutterActorClass *actor_class = CLUTTER_ACTOR_CLASS (klass);
object_class->dispose = meta_background_actor_dispose;
actor_class->get_preferred_width = meta_background_actor_get_preferred_width;
actor_class->get_preferred_height = meta_background_actor_get_preferred_height;
actor_class->paint = meta_background_actor_paint;
#if CLUTTER_CHECK_VERSION(1, 5, 2)
actor_class->get_paint_volume = meta_background_actor_get_paint_volume;
#endif
}
static void
meta_background_actor_init (MetaBackgroundActor *background_actor)
{
}
/**
* @screen: the #MetaScreen
* meta_background_actor_new:
*
* Creates a new actor to draw the background for the given screen.
*
* Return value: (transfer none): the newly created background actor
*/
ClutterActor *
meta_background_actor_new (MetaScreen *screen)
{
MetaBackgroundActor *self;
ClutterActor *stage;
g_return_val_if_fail (META_IS_SCREEN (screen), NULL);
self = g_object_new (META_TYPE_BACKGROUND_ACTOR, NULL);
self->screen = screen;
self->material = meta_create_texture_material (NULL);
cogl_material_set_layer_wrap_mode (self->material, 0,
COGL_MATERIAL_WRAP_MODE_REPEAT);
stage = meta_get_stage_for_screen (self->screen);
g_signal_connect (stage, "notify::color",
G_CALLBACK (on_notify_stage_color), self);
meta_background_actor_update (self);
return CLUTTER_ACTOR (self);
}
/**
* meta_background_actor_update:
* @self: a #MetaBackgroundActor
*
* Refetches the _XROOTPMAP_ID property for the root window and updates
* the contents of the background actor based on that. There's no attempt
* to optimize out pixmap values that don't change (since a root pixmap
* could be replaced by with another pixmap with the same ID under some
* circumstances), so this should only be called when we actually receive
* a PropertyNotify event for the property.
*/
void
meta_background_actor_update (MetaBackgroundActor *self)
{
MetaDisplay *display;
MetaCompositor *compositor;
Atom type;
int format;
gulong nitems;
gulong bytes_after;
guchar *data;
Pixmap root_pixmap_id;
g_return_if_fail (META_IS_BACKGROUND_ACTOR (self));
display = meta_screen_get_display (self->screen);
compositor = meta_display_get_compositor (display);
root_pixmap_id = None;
if (!XGetWindowProperty (meta_display_get_xdisplay (display),
meta_screen_get_xroot (self->screen),
compositor->atom_x_root_pixmap,
0, LONG_MAX,
False,
AnyPropertyType,
&type, &format, &nitems, &bytes_after, &data) &&
type != None)
{
/* Got a property. */
if (type == XA_PIXMAP && format == 32 && nitems == 1)
{
/* Was what we expected. */
root_pixmap_id = *(Pixmap *)data;
}
XFree(data);
}
if (root_pixmap_id != None)
{
CoglHandle texture;
meta_error_trap_push (display);
texture = cogl_texture_pixmap_x11_new (root_pixmap_id, FALSE);
meta_error_trap_pop (display);
if (texture != COGL_INVALID_HANDLE)
{
set_texture (self, texture);
cogl_handle_unref (texture);
self->have_pixmap = True;
return;
}
}
self->have_pixmap = False;
set_texture_to_stage_color (self);
}
/**
* meta_background_actor_set_visible_region:
* @self: a #MetaBackgroundActor
* @visible_region: (allow-none): the area of the actor (in allocate-relative
* coordinates) that is visible.
*
* Sets the area of the background that is unobscured by overlapping windows.
* This is used to optimize and only paint the visible portions.
*/
void
meta_background_actor_set_visible_region (MetaBackgroundActor *self,
cairo_region_t *visible_region)
{
g_return_if_fail (META_IS_BACKGROUND_ACTOR (self));
if (self->visible_region)
{
cairo_region_destroy (self->visible_region);
self->visible_region = NULL;
}
if (visible_region)
{
cairo_rectangle_int_t screen_rect = { 0 };
meta_screen_get_size (self->screen, &screen_rect.width, &screen_rect.height);
/* Doing the intersection here is probably unnecessary - MetaWindowGroup
* should never compute a visible area that's larger than the root screen!
* but it's not that expensive and adds some extra robustness.
*/
self->visible_region = cairo_region_create_rectangle (&screen_rect);
cairo_region_intersect (self->visible_region, visible_region);
}
}
/**
* meta_background_actor_screen_size_changed:
* @self: a #MetaBackgroundActor
*
* Called by the compositor when the size of the #MetaScreen changes
*/
void
meta_background_actor_screen_size_changed (MetaBackgroundActor *self)
{
update_wrap_mode (self);
clutter_actor_queue_relayout (CLUTTER_ACTOR (self));
}